I'm using a Juniper vSRX image in GNS3.
Why can I see my
ge0/0/0 in config mode, but not outside of?
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You're likely emulating using the wrong NICs. If the correct NICs are used the ge interfaces should appear in 'show interfaces terse'.
Configuring them is one thing... but having them actually present within the virtualized device is entirely different.
If you're using virtualbox to run the vSRX image then try - paravirtualized network (virtio-net) NIC. I believe that should help.